<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<style>
    * {
        margin: 0;
        padding: 0;
        list-style: none;
    }
    
    .box {
        width: 520px;
        height: 80%;
    }
    
    html,
    body {
        width: 100%;
        height: 100%;
    }
    
    .item {
        width: 100%;
        height: 100px;
        background-color: aqua;
        display: flex;
        align-items: center;
        justify-content: center;
    }
    
    .content {
        width: 100%;
        height: calc(100vh - 100px);
        background-color: bisque;
        overflow-y: auto;
    }
    /* 去除滚动条 */
    
    .content::-webkit-scrollbar {
        display: none
    }
    
    .content>li {
        height: 200px;
        border-bottom: 2px solid #000;
    }
</style>

<body>

    <div class="box">
        <div class="item">固定的</div>
        <ul class="content">
            <li>1</li>
            <li>2</li>
            <li>3</li>
            <li>4</li>
            <li>5</li>
            <li>6</li>
            <li>7</li>
            <li>8</li>
            <li>9</li>
            <li>10</li>
        </ul>
    </div>
</body>

</html>